Heating apparatus



May 16, 1944. M. L. MUELLER 2,348,835

HEATING APPARATUS Filed Sept. 2, 1942 3 Sheets-Sheet l Mblgz lz X. Mueller: k W

' May 16, 1944.

M. L. MUELLER HEATING APPARATUS Filed Sept.

2, 1942 3 Sheets-Sheet 2 Z 22% I j i Q a heating apparatushaving forgenerating heated products of combustion Patented May 16, ,1944

nes'rme mansrns Morita L. Mueller, Seattle, Wash., asslgnor, by mesne assignments, to Morita L. Mueller and John H. Mueller, Seattle, Wash. as joint tenants Application September 2, 1942 Serial No. 457,065

22 Claims.

This invention relates to heating apparatus and has particular reference to an apparatus or system wherein heated products of combustion are generated and utilized for heating air and for other purposes, such, as heating water: the system being provided with means for supplying such heated air to a space in a building to be occupied by and for the comfort of human beings and such system also being constructed and arranged so that the heated products of combustion may be utilized for other purposes, such as heating water, simultaneously with or independently of the supplying of heated air to said space.

A principal object of the invention is to provide fuel burning means with a heat exchanger for heating air, and another heat exchanger, for utilizing such heated products of combustion for another purpose, such as heating water,,together with means for dissipating the heat from the air heat exchanger at such time as it is desired to utilize the other heat exchanger without supplying'heated- 'air to the space in the building with which the heating apparatus is operatively associated.

Another object of the invention is to provide,

the hereinafter disclosed improvements upon the chimney furnace type of heating system disclosed 4 in my Patent No. 2,274,341, issued February 24,

1942, for "Heating apparatus."

Other objects and advantages ofthe invention will be a parent from a consideration of the following specification taken in conjunction with the accompanying drawings, of which there are three sheetsand wherein:

- Fig. 1 is a vertical cross section through a part of a house illustrating one form of heating apneratus embodying the invention;

Fig. 2 is anenlarged fragmentary view partially in elevation and partially in section of the heatin apparatus; Y

. Fig. 3 is an enlarged vertical sectional view of the upper part of the heating apparatus with certain parts being shown in elevation and taken generalLv along the line 8-3 of Fig. 2, looking in the directionof the arm:

Fig. 4 is a view'similar to Fig. 3 and illustra a modification thereof;

, Fig. 5 is a horizontal sectional view taken in a plane along the line H of Fig. 4, looking in the, direction of the arrows;

Fig. is a view taken along-the line H of m. 5, looking in the direction of the arrays;

similar to Fig. 1 and illustrating a modification thereof;

Fig. 8 is a fragmentary vertical sectional view similar to Figs. 1 and 7 and illustrating a modification thereof;

.Fig. 9 is a fragmentary vertical sectional view simialr to Figs. 1 and 7 and illustrating a modification thereof;

Fig. 10 is a horizontal sectional view taken 10 along the line ll-ll of Fig. 9, looking in the direction of the arrows.

Referring now to Figs. 1 to 3, there is illustrated, somewhat diagrammatically, a house having one or more rooms 2! with an attic space 22 formed thereabove and below the roof 24hr the building. The attic space may be ventilated by one or more louvered openings such as that indicated at 28. A heating apparatus embodying the invention and of the in my aforesaid patent is provided for hes the space in the rooms 20 and for heating hot water, and in general comprises a chimney 28 which extends upright to and above the roof 24 of the building and is provided with an atmospheric discharge a external of the spacein the house. The chimney, as illustrated, may be of masonry construction and is erected upon a footing 32 disposed below the level of the floor N of the house. The

chimney 28 preferably is located inside of the 30 side walls of the house and extends upwardly through suitable openings formed in the floor 14, ceiling it, and roof ll of the house.

The heating apparatus in addition includes a combustion chamber 8. having fuel burning means operatively associated therewith and locatedin the lower partof the chimney 20, prefersbly so as to be accessible'from the floor 3|. An air heat exchanger member ll comprising a pipe or tubular member is vertically arranged in 40 the space in the chimney a and a adapted'to divide the space therein into a path or passageway I: for air and a path or passageway within 1 the member ll for the upward flow under natural draft of the products of combustion, generated in the combustion chamber 8! to the atmospheric discharge 8.. The heat exchanger member 40 extendsfromtheeombustionchamberfltoa point short of theupper end of the chimney, and

asillustratedinl'lgl- 1 and8,mayterminateiust belowtheroof2l.of'thebuilding.'1helength and diameter of the heat exchanger member I ofeours'ewilldeterminetheheatexchangesurface for heatingairandshould becorrelated with requirements of the house.

Fig. l is a iragmentaryvertical sectional view The upper end of the air path H is separated walls 84 which define the combustion chamber 38.

The walls 54 which define the combustion chamber may be formed of fire brick and may, as illustrated, be slightly spaced from the outside walls of the chimney 28. One face of the chimney, as illustrated in Fig. 1, may be provided with an opening which is closed by a metal panel 88, such panel being provided with openings normally closed by doors 88 and 88, which provide access to the combustion chamber 88 and ash pit 82 respectively, the latter being disposed below the grates 84 of the fuel burning means which, in the particular embodiment illustrated, is adapted for burning hard fuel such as coal so as to generate heated products of combustion. The door 88, of

course, is provided with suitable adjustable means (not shown) for admitting air into the combustion chamber to efficiently support combustion therein. I also contemplate that other forms and arrangements of fuel burning means may be used, such for example as those illustrated in my copending applications Ser. No. 427,734, flled January 22, 1942, for Heating apparatus," and Ser. No. 435,813, filed March 23, 1942, for Heating apparatus."

A second heat exchanger member 88 and which may comprise a water heating coil is arranged in the combustion chamber 38 so as to be heated during such time as the fuel burning means are operative. The heat exchanger member 48 is spaced from the inside wall of the chimney 28 so as to provide the air passageway 42 therebetween through which air is circulated in countercurrent heat exchange relationship with the combustion products. Air under pressure is delivered to the upper end of the air passageway 42 by a blower 88, the discharge 18 of the'blower being arranged in a suitable opening in the upper portion of the chimney 28 immediately below the plate 48 and delivering air into the air passageway 42 in such a way that it .tends to spiral downwardly through the passageway 42 and around the heat achanger member 48.

The lower end of the air passageway 42 is provided with one or more warm air outlets 12 which may comprise grilled openings formed in the chimney wall 28 opposite the lower end of the exchanger 48 and which are adapted to deliver warm air laterally and/or downwardly into the space in the rooms 28 to be heated.

The blower 88 comprises a pressure type of blower and may be mounted upon a plate 14 secured to the upper portion of the chimney around ceiling joists of the house. The duct 82 communicates with one or more vertical ducts 84 formed between the wall studding, the ducts-84 having re-., turn air inlets or openings 88 at their lower end communicating with the space in the rooms 28.

' chimney, and as a result thereof the heat exascaess Thus air from the space to be heated is circulated through the ducts 84, 82, and 88 and is delivered through the pipe I8 to the blower which forces such air through the heating apparatus and particularly the air passageway 42 thereof and such air after being heated is delivered by the warm air outlets into the space in the rooms 28.

The end of the pipe I8 opposite the intake to the blower 88 is provided with a relief vent which is closed whenever the blower is operating but which is adapted to open during the operation of the fuel burning means if the blower fails to operate. Such end of the pipe I8 is provided with a cap 88 having an opening or vent therein adapted to be closed'by a damper 84 pivoted at 88. A bracket 88 is fixed to the inside face of the opening so as to limit the opening movement of the damper 84, as illustrated in Fig. 2.

The bracket 88 is also provided with another leg l82.which is adapted to beengaged by a thermostatic element I84 carried by the cap 88 and exposed to the temperature of the air inside of the pipe I8. As the thermostatic element I84 heats up, it engages the leg I82 of the bracket 88 and exerts a force in a clockwise direction on the pivot 88 of the damper 84 when the same is in its closed position. This force exerted by the thermostatic element I84 will move the damper 84 sufficiently about its pivot 88 so as to cause it to fall by gravity to the open position in which it is illustrated in Figs. 1 and 2. If the fuel burning means are generating heated products of combustion. such will pass upwardly under natural draft through the interior of the heat exchanger member 48 and the chimney thereabove to atmosphere through the opening 88 in the upper end of the changer member 48 and the air in the passageway 42 will become heated.

If the blower 88 fails to operate as it should, due to current failure for example, when the heat exchanger member 48 is heated there will be no air movement through the passageway 42 under the influence of blower 88. The air in the interior of the pipe 18 communicating through the blower 88 and th discharge I8 will at such time be heated and in turn will heat the thermostatic element I84 which will act as previously described to unbalance the damper 84 and thereby open the same, thereby venting the upper end of the air path or passageway 42 through the blower discharge I8, the blower 88, the intake thereof,

the pipe I8, and opening in the end of the pipe I8 to the attic space 22, as a result of which air will flow into the air passageway 42 through the opening I2, upwardly due to gravity through the air passageway 42, and through the blower and pipe 18 into the attic 22. From the attic the heated air may be vented, for example by the louvered openlugs 28. I In this way the heat generated in the heating apparatus will be dissipated therefrom and from the building if the blower 88 does not operate.

The motor 18. for the blower 88 is supplied with current by a wiring circuit diagrammatically indicated at H8, and which wiring circuit has arranged therein a thermostatically controlled blower switch I I2 and a manually operated switch H4. The thermostatic switch II2 includes a thermal element H8 which is arranged inside of the chimney 28 immediately above the heat exchanger member 48 in the path of the flue" gases so as to beresponsive to the temperature thereof, and preferably is set so as to close the blower motor circuit, when the flue gas temperature at such point reaches for example 225' F. and to open the motor circuit when the flue gas temperature at. such point falls for example to 125. F. In this way the blower is cut in after the heat exchanger member 48 is heated and is effective for circulating air over the heat exchange surface thereof and into the space to be heated, as previously described. When the flue gas temperaturedecreases to 125 F. the blower is cut out. The switch II should be closed during the heating season so that the'operation of the blower will be controlled by the thermostatic switch I I2.

The water heating coil 88 is operatlvely connected to a water storage tank II8, the intake side of the coil 68 being connected to the lower part of the tank I,I8and the upper part of the coil 86. being connected to the upper part of the tank III which in a conventional manner is coninected into the water system of the house by cold water pipe I28 and hot water pipe I22. The operation of thefuel burning means will, in addition to heating the air which is supplied to the house during the heating season as previously described, also function to heat the water in the tank 8. The water from the tank 8 will circulate through the coil 88 when heated, as well understood in the art.

ly through the path 82 and dissipate heat from theheat exchanger and the heated air will then be vented through the opening into the attic 22 and from thence through the louvered openings 28 to the outside of the house.

In order to prevent the operation of the blower 88 during such time as it is not desired to have the space in the house supplied with heated air, the, manually operated switch I Il may be opened, thereby cutting the blower motor out of operation, and when the thermostatic element I88 of the relief damper apparatus becomes heated,

{the reliefidamper 88 will open. While the relief damper 88 functions primarily as a safety device for dissipatingheat from the heating apparatus in the event of the failure of the blower to operdamper I82 may be open, the open position being illustrated in dotted lines in Fig. 3, thereby opening the by-pass I28 and permitting air from I the passageway 42 to pass through the by-pass I28. into the flue passageway 44 and thence "through the outlet 88 to the exterior of the house.

With the switch'IH open the blower 88 will not operate and at such time fuel may be burned in the combustion chamber 88 for the purpose of heating the coil 88 for the purpose of heating water and without having heated air supplied to the space in the house. Also 'it will be noted that the entire heat generated in the heating apparatus except that absorbed by the water will be' dissipated through the chimney 28 to atmosphere.

In'the embodiment of the invention illustrated in Figs. 4, 5, and 6, the construction is the same as that illustrated in the preceding figures except in the following particulars. In this case the by-pass 228, which is arranged the same as the by-pass I28, is provided with a damper 282 which is adapted to be automatically opened when the temperature of the air at the upper end of the air path 42 reaches a predetermined degree (preferably higher than that at arm 288 aflixed tothe damper .282. Upon heating up of the thermostatic element 288 the same will through the link 288 and arm 2" shift the damper 282 to its open position, or otherwise stated, will move the damper 282 from the position shown in full lines to the position shown in dotted lines in Fig. 5. With the damper 232 o en the air from the air path 42 will be free to flow through the by-pass 226 into the flue passageway and escape through the chimney 28 to atmosphere. Also at such time air may escape from the air path 42 through the relief vent at the end of pipe I8 as illustrated in Figs. 1-3,

although this relief vent may, in this embodiate,'it may be relied upon to dissipate heat from y the apparatus during such time as only the heating of water is desired by opening the switch I I8- .It is contemplated, however, that at such time as only the heating of water is' desired than anaddition'al or optional manner of dissipating heat from the "apparatus may be used, and this compris'es a by-pass I28 between the end of the air passageway 82' and the flue passageway 88 and aroundthe plate 88. This by-pass may take the form of a conduit, one end I28 of which communicates through a suitable opening in the wall of the chimney with the upper end of the f' air'passagewayffl and the other end I88 of which communicates with the flue passageway 88 above the plate 88 through a suitable opening in the wall of the chimney 28.

During the heating season the by-pass I28 is closed by a damper I82 which is adapted to be son that no heat-is required in the house the opening the switch II in order to eliminate the supply of heated airto the space in the houseand to permit the operation of the heating apparatus for. the purpose of heating water only.

In the modification disclosed in Fig. 7, the construction and operation is the same as that illustrated in either of the foregoing embodiments except as modified by the following. A heater or stove 888 comprising a combustion chamber having fuel burning means operatively associated therewith, adapted, for example, to

burn coal. is provided, inaddition to the fuel binning means associated with the combustion chamber in the chimney 28, and the flue gases generated by the burning-of fuel inthe combustion chamber or heater. 888 are vented by a damper controlled smoke pipe 882 into the combastion chamber 88 and from thence are vented eludes a heat exchanger of the jacket type for' heating water. A water storage tank lilflmay be operatively associated with the heat 'exchanger of the heater 300 in a manner similar to that in which the coil 66 is connected to the tank 8 as illustrated in Figs. 1 and 2. As the flue gases from the heater 300 are conducted to atmosphere through the chimney 28 and the heat exchanger member 40, the heat which will be absorbed from such flue gases by the member 40 and the air in the passageway 42 may be dissipated by the means as illustrated in the previous embodiments of the invention, if it is not desired to utilize such heat forheating air to be supplied to the space in the house. The heater 300 may be operated independently of the fuel burning means in the combustion chamber 38 and at such time the heating system may function to heat water and/or to supply heat to the space in the building depending upon whether the motor blower circuit is open or closed as illustrated in connection with the previous embodiment. The fuel burning means in the combustion chamber 38 may be operated independently of the heater 300 if no hot water is desired, or simultaneously with the heater 3" if the required heat load for heating the house is in excess of that which can be provided by the heater 300.

In the modification disclosed in Fig. 8, a combined gas water heater and storage tank is indicated at 400 and may be disposed alongside the heating apparatus which is constructed and operates the same as that illustrated in any of the previously described embodiments of theinvention except as modified by the differences hereinafter set forth. The flue gases from the heater 400 may be conducted by a smoke pipe 02 disposed externally of the chimney 28 and discharged into the flue passageway 44 above the plate 48 and opposite switch 2. The smoke pipe 2 where it is connected to the heater 400 may also have an air intake opening beneath the shield 406 so as to permit air to be drawn into the smoke pipe 402 along with the flue gases therein.

In the embodiment illustrated. in Figs. 9 and 10, the construction and operation of the heating apparatus is the same as that illustrated in any of the foregoing embodiments except as modified by the following particulars. In this case the chimney 28 above the lower part thereof may be built of. hollow tile sons to provide a vertical flue passageway 502 connected at its upper end 504 to the flue passageway 44 above the heat exchanger 40. The lower end I!" of the flue passageway 502 may have connected thereto a smoke pipe 808 from a side arm type of gas water heater illL. In this way the products of combustion generated during the operation of the heater BIO are vented through the pipe I08 and fiue 502 to the upper part of the flue passageway M and hence like in the con- 'struction illustrated in 8 are not brought gasesresulting from theoperation of the. water heater. The heater II I. of course maybe eonventionally-connected to a hot water storage 1| tank such as 8 and may be operated either automatically or by manual control. I 7

While the invention has been described with some detail, it is to be understood that thede; scription is for the purpose of illustration and is not definitive of the limits of the invenitive idea; The right is reserved to makeisuch changes in the details of construction and arrangement of parts as will fall withinlthe purview of the attached claims.

I claim: t

1. A heating system for heating water and supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a chimney which forms part of the building and which extends upright to and above the roof of the building and has an atmospheric discharge external of the space, a combustion chamber having means associated therewith which are constructed and arranged for burning fuel so as to generate heated products of combustion, awater heater arranged to be heated by said fuel burning means during the operation thereof, a heat exchanger member extending longitudinally of and for a substan tial portion of the length of said chimney, said heat exchanger member and chimney providing a path through which the products of combustion flow from said combustion chamber to said atmospheric discharge and a separate path for flow of air in intimate countercurrent heat exchange relationship with at least a part of saidcombustion products path, means including an air blower operable to supply from said space to the upper portion of said air path, air to be heated and under a pressure greater than the pressure of the products of combustion, the lower end of said air path having an outlet for discharging heated air into said space during the operation of said air blower, said air blower normally being arranged so as to be operated when heated products of combustion are being generated at a substantial rate, means for preventing the operation of said air blower as aforesaid without interfering withthe generation of heated products of combustion, and a relief vent at the upper end of said air path for automatically venting the same externally of said space so as to dissipate from said heat exchanger member the heat absorbed thereby when said fuel burning means are operated for the purpose of heating water without, supplying heater air to said space. I

2. A heating system for supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a chimney which forms part of the building and which extends upright to and above the roof of the building and has an atmospheric discharge external of the space, means whichare constructed and arranged. for burning fuel so as to g erate heated products of combustioma heatexchanger device arranged to be heated by said fuel buming means during the operation thereof, a heat exchanger member extending longitudinallyof and for a substantial portion of the length of said chimney, said heat exchanger member and chimney providing a path thorough which said products of combustion flow tosaid atmospheric discharge and aseparate path for flowof air in intimate countercurrent heat exchange. relationship with saidcombustion products path; means aseasss air to be heated and under a pressure greater than the pressure of the products of combustion, the lower end of said air path having an outlet for discharging heated air into said space during the operation of said air blower, said air blower normally being arranged so as to be operated when heated products of combustion are being generated at a substantial rate, means for preventing the operation of said air blower as aforesaid without interfering with the generation of heated products of combustion, and a relief vent at the upper end of said air path for automatically venting said air path externally of said space $0055 to dissipate from said heat exchanger member the heat absorbed thereby when said fuel burning means are operated for the purpose of heating said heat exchanger device without supplying heated air. to said space.

3. A heating system for heating water and supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a chimney which forms part of the building and which extends upright to and above the roof of the building and has an atmospheric discharge external of the space, a combustion chamber having .means associated therewith,

which are constructed and arranged for burning fuel so as to generate heated products of combustion, a water heater arranged to be heated by said fuel burning means during the operation thereof, a heat exchanger member extending longitudinally of and for a substantial portion of the length of said chimney, said heat exchanger.

member and chimney providing a path for the upward flow of the products of combustion from said combustion chamber to said atmospheric discharge and a separate path for flow of air in intimate countercurrent' heat exchange relationship with the combustion products, means including an air blower operable to supply from said space to the upper portion of said air path, air to be heated and under a pressure greater than thepressure of the products of combustion,

. the lower end of said air path having an outlet for discharging heated air into said space during the operation of said air blower, said air blower normally being arranged so as to be operated when heated products of combustion are being generated at a substantial rate, means for preventing the operation of said air blower as aforesaid without interfering with the generation of heated products'of combustion, and a relief vent at the upper end of said airpath communicating with the atmosphere through said combustion products path for automatically venting said air path of atmosphere so as to dissipate from said heat exchanger member the heat absorbed thereby when said fuel burning means are operated Y for the purpose of heating water without supplyingheated air to said space,

4. A heating system for heating water and supplying heated air toa space in a building to portion of the length of said chimney, said heat exchanger member and chimney providing a path for the upward flow of the products of combustion from said combustion chamber to said atmospheric discharge and a separate path for flow of air in intimate counter-current heat exchange relationship with the combustion products, means including an air blower operable to supply from said space to the upper portion of said air path, air to be heated and under a pressure greater than the pressure of the products of combustion, the lower end of said air path having an outlet for discharging heated air into said space during the operation of said air blower, said air blower normally being arranged so as to be operated when heated products of combustion are being generated at a substantial rate, means for preventing the operation of said air blower as aforesaid without interfering with the generation of heated products of combustion, and a by-pass between the upper end of said air path and said combustion products path for venting said air path to atmosphere so as to-dismeans are operated for the purpose of heating be occupied by and for the comfort of human water without supplying heated air to said space 5. A heating system for heating water and supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a chimney which forms part of thebuilding and which extends upright to and above the roof of the building and has an atmospheric discharge external of the space, a combustion chamber having means associated therewith which are constructed and arranged for burning fuel so as to generate heated products of combustion, a water heater arranged to be heated by said fuel burning means during the operation thereof, a heat exchanger member extending longitudinally of and for a substantial portion of the length of said chimney, said heat exchanger member and chimney providing a path for the upward flow of the products of combustion from said combustion chamber to said atmospheric discharge and a separate path for flow of air in intimate countercurrent heat exchange relationship with the combustion products, means including an air blower operable to supply from said space to the upper portion of said air path, air to be heated and under a pressure greater than the pressure of the products of combustion, the lower end of said air path having an outlet for discharging heated air into said space during the operation of said air blower, said said blower normally being operated when heated products of combustion are being generated at a substantial rate, means for preventing the operation of said air blower as aforesaid without interfering with the generation of heated products of combustion, a by-pass between the upper end of said air path and said combustion products path for venting said air path to atmosphere so as to dissipate from'said heat exchanger member the heat absorbed thereby when said fuel burning means are operated for the purpose of heating water without supplying heated 'air to' said space, and a damper for closing said by-pass when said air blower is operating.

6. A heating system for heating water and supplying heated air to aspace in a building to be occupied by and for the comfort of human 1 beings comprising a chimney which forms part of the building and which extends upright to and above the roof of the building and has an at- 'mospheric discharge external of the space, a

combustion chamber having means associated therewith which are constructed and arranged for burning fuel so'as to generate heated products of combustion, a water heater arranged to be heated by said fuel burning means during the operation thereof, a heat exchanger member extending longitudinally of and for a substantial portion of the length of said chimney, said heat exchanger member and chimney providing a path for the upward flow of the products of combustion from said combustion chamber to said atmospheric discharge and a separate path for flowof air in intimate counter-current heat.

exchange relationship with the combustion products, means including an air blower operable to supply from said space to .the upper portion of said air path, air to be heated and under a pressure greater than the pressure of the products of combustion products path for venting said air path to atmosphere so as to dissipate from said heat exchanger member the heat absorbed thereby when said fuel burning means are operated for the purpose of heating water without supplying heated air to said space, and a damper normally closing said by-pass and adapted for opening said by-pass when said air blower is not operating and water is being heated in said water heater by the operation of said fuel burning means.

7. A heating system for heating water and supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a chimney which forms part of the building and which extends upright to said combustion products path for venting said air path to atmosphere so as to dissipate from said heat exchanger member the heat absorbed thereby when said fuel burning means are operated for the purpose of heating water without supplying heated air to said space, a damper normally closing said by-pass andadapted for opening said by-pass whensaid air blower is not operating and water is being heated in said water heater by the operation of said fuel burning means, and a manuallyoperable control for said damper. 8. A heating, system for heating water an supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a chimney which forms part of the building and which extends upright to and above the roof of the building and has an atmospheric discharge external of the space, a combustion chamber having means associated therewith which are constructed and arranged for burning fuel so as to generate heated products of combustion, a water heater arranged to be heated by said fuel burning means during the operation thereof, a heat exchanger member extending longitudinally of and for a substantial portion of the length of said chimney, said heatexchanger member and chimney providing a path for the upward flow of the products of having an outlet for discharging heated air into and above. the roof of the building and has an atmospheric discharge external of the space, a combustion chamber having means associated therewith which are constructed and arranged for burning fuel so as to generate heated products of combustion, a water heater arranged to be heated by said fuel burning means during the operation thereof, a heat exchanger member extending longitudinally of and for a substantial portion of the length of said chimney, said heat exchanger member and chimney providing a' path for the upward flow of the products of combustion from said combustion chamber to i said atmospheric discharge and a separate path for flow of air in intimate countercurrent )ieat exchange relationship with the combustion products, means'including an air blower operable to supply from said space to the upper said space during the operation of said air blower, said air blower normally being operated when heated products of combustion are being generated at a substantial rate, means for preventing the operation of said airblower as aforesaid without interfering with the generation of heated products of combustion, a by-psss between the upper end of said air path and said combustion products path for venting said air path to atmosphere so as to dissipate from said heat exchanger member the heat absorbed thereby when said fuel burning means are operated for the purpose of heating water without supplying'heated air to said space, a damper normally closing said by-pass and adapted to open said by-pass when said air blower is not operating and water-is being heated in said water heater by the operation of said fuel burning means, and thermostatic means responsive to the temperature adjacent the upper end of said heat exchanger member for opening said damper.

9. A heating system for heating water and supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a chimney which forms part of the building and which extends upright to and above the roof of the building and has an atmospheric discharge external of the space, a combustion chamber having means associated therewith which are constructed and arranged for burning fuel so as to generate heated products of combastion, a water heater arranged to be heated by said fuel burning means during the operation thereof, a heat exchanger member extending lonitudinally of and for a substantial portion of the length of said chimney, said heat exchanger ship with the combustion products, means including an air blower operable to supply from said be heated and under a pressure greater than the pressureofthe products of combustion, the lower space to the upper portion of said air path, air to end of said air path having an outlet, for discharging heated air into said. space during the operation of said air blower, said air blower normally being operated when heated products of combustion are being generated at a substantial rate, means for preventing the operation of said air blower as aforesaid without interfering with the generation of heated products of combustion, a by-pass between the'upper end of said air path and said combustion products path for venting said air path to atmosphere so as to dissipate from said heat exchanger member the heat absorbed thereby when-said fuel burning means are operated for the purpose of heating water without supplying heated air to said space, a damper normally closing said by-pass and adapted to open said by-pass when said air blower is not operating and water is being heated in said water heater b the operation of said fuel burning means, and thermostatic means responsive to the air temperature at the upper end of said air path for opening and closing said damper.

10. A heating system for heating water and supplying heated air to a space in a building to be occupied by and for the comfort of'human beings comprising a chimney which forms part of the building and which extends upright to and above the roof of the building and has an atmospheric dischar e external of the space, a combustion chamber having means associated therewith which are constructed and arranged for burning fuel so as to generate heated products of combustion, a water heater arranged to be heated by said fuel burning means during the operation thereof, a heat exchanger member extending iongitudinally of and for a substantial portion of the length of said chimney, said heat exchanger member and chimney providing a path for the upward flow of the products of combustion from said combustion chamber to said atmospheric discharge and a separate path for flow of air in intimate countercurrent heat exchange relationship with the combustion products, means including an air blower operable to supplyfrom said space to the upper portion of said air path, air to be heated and under a pressure greater than the pressure of the products of combustion, the lower end of said air path having an outlet for discharga ing heated air into said space during the opera tion of said air blower, said air blower normally being operated when heated products of combustion are being generated at a substantial rate,

means'for preventing the operation of said air blower as aforesaid without interfering with the generation of heated products of combustion, a relief vent at the upper end of said air path communicating with the atmosphere for venting said air path to' atmosphere so as to dissipate from said heat exchanger member the heat absorbed thereby when said fuel burning means are operated for the purpose of heating water without supplying heated air to said space, and a damper for closing said vent when said air blower is operating.

11. A heating system for heating water and II the operation of said air moving device, said 7 supplying heated air to a space in abuilding to be building and which extends upright to and above the roof of the building and has an atmospheric discharge external of the space, a combustion chamber having means associated therewith which are constructed and arranged for burning fuel so as to generate heated products of combustion, a water heater arranged to be heated by said fuel burning means during the operation thereof, a heat exchanger member extending iongitudinally of and for a substantial portion of the length of said chimney, said heat exchanger member and chimney providing a path for the upward flow of the products of combustion from said combustion chamber to said atmospheric discharge and a separate path for flow of air in intimate countercurrent heat exchange relationship with the combustion products, means including an air blower operable to supply from said space to the upper portion of said air path, air to be heated and under a pressure greater than the pressure of the products of combustion, the lower end of said air path having an outlet for discharging heated air into said space during the operation or said air blower, said air blower normally being operated when heated products of combustion are being generated at a substantial rate, means for preventing the operation of said air blower as aforesaid without interfering with the generation of heated products of combustion, a relief vent at the upper end of said air, path communicating with the atmosphere for venting said air path to atmosphere so as to dissipate from said heat exchanger member the heat ab-- sorbed thereby when said fuel burning means are operated for the purpose of heating water without supplying heated air to said space, and a damper normally closing said vent and adapted to open said vent when said air blower is not operatin and water is being heated in said water heater by the operation of said fuel burning means.

12. A heating system for heating water and supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a chimney which forms part of the building and which extends upright to and above the roof of the building and has an atmospheric discharge external of the'space, a combustion chamber in the lower portion of said chimney, means associated with said combustion chamber and constructed and arranged for burning fuel under natural draft so as tocombustion products, means including an air moving device operable to supply from said space to the upper portion of said air path, air to be heated and under a pressure greater than the pressure of the products of combustion, the

lower end of said air path having an outlet for disc a ging heated air into said space during a, member attains a predetermined amount and to discontinue operation when the temperature of v the combustion products at the upper end of said heat exchanger falls below a predetermined amount, means for preventing the operation of said air moving device as aforesaid without interfering with the generation of heated products of combustion, and a relief vent at the upper end of said air path for venting the same externally of said space so as .to dissipate from said heat exchanger member the heat absorbed thereby when said fuel burning means are operated for the purpose of heating water without supplying heated air to said space.

13. A heating system for heating water and supplying heatedair to a space in a building to be occupied by and for the comfort of human beings comprising a chimney which forms part of the building and which extends upright to and above the roof of the building and has an atmospheric discharge external of the space, a combustion chamber having means associated therewith which are constructed and arranged for burning fuel so as to generate heated prodnets of combustion, a water heater arranged to be heated by said fuel burning means during products, means including an air blower operable to supply from said space to the upper portion of said air path, air to be heated and under a pressure greater than the pressure of the products of combustion, the lower end of said air path having an outlet for discharging heated air into said space during the operation of said air blower, said air blower normally being operated when heated products of combustion are being generated at a substantial rate, means for preventing the operation of said air blower as aforesaid without interfering with the generation of heated products of combustion, a relief vent at the upper end of said air path communicating with the atmosphere for venting said air path to atmosphere so as to dissipate from said heat eration of said fuel burning means, and thermostatic means responsive to the air temperature at the upper end of said air path for opening said damper.

14. A heating system for heating water and supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a chimney which forms part of the building and which extends upright to and above the roof of thebuilding and has an atmosburning fuel so as to generate heated products of combustion, a water heater arranged to be heated by said fuel burning means during the operation thereof, a heat exchanger member extending longitudinally of and for a substantial portion of the length of said chimney, said heat exchanger member and chimney providinga path for the upward flow of the products of combustion from said combustion chamber to said atmospheric dischargeand a separate path for flow of air in" intimate countercurrent heat exchange relationship with the combustion products, means including an air blower operable to supply from said space to the upper portion of said air path, air to be heated and under a pressure greater than the pressure of the products of combustion, the lower end of said air path having an outlet for discharging heated air into said space during the operation of said air blower, an electric motor for operating said air blower when heated products of combustion are being generated at a substantial rate, an electric circuit for said motor including a thermostatic switch responsive to the temperature of the combustion products adjacent the upper end of said heat exchanger member, means for pre-- venting the operation of said air blower as aforesaid including a manually operated switch on said circuit and without interfering with the generation of heated products of combustion, a relief vent at the upper end of said air path communicating with the atmosphere for venting said air path to atmosphere so as to dissipate from said heat exchanger member the heat absorbed thereby when said fuelburning means are operated for the purpose of heating water without supplying heated air to said space, and a damper normally closing said vent and adapted to open said vent when said air blower is not operating and water is being heated in said water heater by the operation of said fuel burning means.

15. Heating apparatus for heating water and supplying. heated air to 0 space in a building comprising, a chimney having an atmospheric discharge, means providing a combustion chamber having means associated therewith which are constructed and arranged for burning fuel so as to generate heated products of combustion,

a water heater arranged to be heated by said fuel burning means during the operation there of and operatively connected to a hot water storage tank arranged outside of said chimney, a heat exchanger providing at least part of a path through which the products of combustion flow from said combustion chamber to said atmospheric discharge, and a separate path for flow of air in intimate heat exchange relationship with the combustion products, means including an air moving device operable to supply from said space to one end of said air path, air to be heated and under a pressure greater than the pressure of the products of combustion, the other end of said air path having an outlet for dispheric discharge external of the space, a combustion chamber having means associated therewith which are constructed and arranged for is charging heated air into said space, said air moving device normally being operated when heated products of combustion are being senerated at a-usubstantiai rate, means for preventing the operation of said air moving device as aforesaid without interfering with the generation of heated products of combustion, and a relief vent at the upper end of said air path for venting the same externally of said space so as to dissipate from said heat exchanger member the heat absorbed thereby when it is desired to operate said fuel burning means for the purpose of heating water without supplying heated air tosa'id space.

18. A'heating system for heating water and supplying heated air to a space in a building to be occupied by .and for the comfort of human beings comprising a chimney which forms part and above the roof of the building and has an atmospheric discharge external of the space, means associated with the lower portion of said chimney and constructed and arranged for burning fuel so as to generate heated products .of combustion, a water heater operatively connection between said water heater fuel burning means and said chimney and discharging into said combustion products path at one end of said heat exchanger member, 'meansincluding' an air blower operable to supply from said space to the upper portion of said air path, air to be heated and under a pressure greater than the pressure of the productsv of combustion, the lower end of said air path having an outlet for discharging heated air into said space, an electric motor for operating said air blower, an electric cricuit for said motor including a thermostatic switch having a thermal element responsive to the temperature. of the combustion products at the upper end of said heat exchanger member and 'means, including a manually operated switch in said circuit, for preventing the operation of said air moving device. as aforesaid without interfering with the generation of heated products of combustion when it is desired to operate said water heater fuel burning means for the purpose of heating water without operating said air blower.

17. A heating system for heating water and supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a chimney which forms part of the building and which extends upright to and above the roof of the building and has an atmospheric discharge external 01 the space, means associated with the lower portion of said chimney and constructed and arranged for burning fuel so as to generate heated products of combustion, a water heater operatively connected to a hot water storage tank arranged outside of said chimney, fuel burning means thermally associated with said water heater, a heat exchanger member extending longitudinally of and for a substantial portion of the length of saidchimney, said heatlexchanger member and chimney providing a path for the upward flow.

of the products of combustion from said combustion chamber to said atmospheric discharge and a separate path for flow of air in intimate countercurrent heat exchange relationship with the combustion products, a flue connection between said water heater fuel burning means and said chimney and discharging into said combustion products path at one end of said heat exchanger member, means including an air blower operable of the building and which extends upright to,

to supply from said space to the upperportion' of said air path, air to be heated and under a thermal element responsive to the temperature of the combustion products at the upper end of said heat exchanger member, means, including a manually operated switch in said circuit, for preventing the operation of said air moving device as aforesaid without interfering with. the generation of heated products of combustion when it is desired to operate said water heater fuel burning means for the purpose of heating water without operating said air blower, and a relief vent at the upper end of said air path for venting the same externally of said space.

18. A heating system for heating water and supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a chimneyjwhich forms part of the building and which extends upright to and above the roof of the building and has an atmospheric discharge external 'of the space, means associated with the lower portion of said chimney and constructed and arranged for burning fuel as to generate heated products of combustion, a water heater operatively connected to a hot water storage tank arranged outside of said chimney, fuel burning means thermally associated with said water heater, a heat exchanger member extending longitudinally of and for a substantial portion of the length of said chimney, said heat exchanger-member and chimney providing a path for the upward flow of the products of combustion from said combustion chamber to said atmospheric discharge and a separate path for now of air in intimate countercurrent heat exchange relationship with a the combustion products, a flue connection bemeans associated with the lower portion of said ,76

tween said water heater fuel burning means and said chimney and discharging into said combustion products path at the lower end of said heat exchanger member, means including an air blower operable to supply from said space to the upper portion of said air path, air to be heated and under a pressure greater than the pressure oi! the products of combustion, the lower end of said air path having an outlet for discharging heated air into said space, an electric motor for operating said air blower, an electric circuit for supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a chimney which forms part oi the building and which extends upright to and above the 'roof of the building and has an atmospheric discharge external of the space,

chimney and constructed and arranged for burning fuel so as to generate heated products of combustion, a water heater operatively connected to a hot water storage tank arranged outside of said chimney, fuel burning means thermally associated with said water heater, a heat exchanger member extending longitudinally of and'for a substantial portion of the length of said chimney, said heat exchanger member, and chimney providing a path for the upward flow of the products of combustion from said combustion chamber to said atmospheric discharge and a separate path for flow of air in intimate countercurrent heat exchange relationship with the combustion products, a flue connection between said water heater fuel burnin means and said chimney and discharging into said combustion products path at the upper end of said heat exchanger member, means including an air blower operable to supply from said spaceto the upper portion of said air path, air to be heated and under a pressure greater than the pressure of the products of combustion, the lower end of said air path having an outlet for discharging heated air into said space, an electric motor for operating said air blower, an electric circuit for said motor including a thermostatic switch having a thermal element responsive to the temperature-of the combustion products at the. upper end of said heat exchanger member and means, including a manually operated switch in said circuit, for preventing the operation of said air moving device as aforesaid without interfering with the generation of heated products of combustion when it is desired to operatesaid water heater fuel burning means for the purpose of heating water without operating said air blower.

20. A heating system for heating water and supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a chimney which forms part of the building and which extends upright to and above the roof of the building and has an atmospheric discharge external of the space, means associated with the lower portion of said chimney and constructed andarranged for buming fuel so as to generate heated products of combustioma water heater operatively connected to I a hot water storage tank arranged outside of said chimney, fuel burning means thermally associated with said water heater, a heat exchanger member extending longitudinally of and for a substantial portion of the length of said chimney, said heat exchanger member and chimney providing a path'for the upward flow of the products of combustion from said combustion chamber to said atmospheric discharge and a separate path for flow of air in intimate countercurrent heat exchange relationship with the combustion products, a flue connection [between said water heater fuel burning means-and said chimney and discharging into said combustion of the combustion products at the upper end of said heat exchanger member and means, including a manually operated switch in said circuit, for preventing the operation of said air moving device as aforesaid without interfering with the generation of heated products of combustion when it is desired to operate said water heater fuel burning means for the purpose of heating water without operating said air blower, said chimney being formed in part of hollow tile and said flue connection being formed at least in part by said'hollow tile.

21. A heating system for supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a chimney which forms part of the building and which extends upright to and above the roof of the building'and has an atmospheric discharge external of the space, means associated with the lower portion of said chimney and constructed and arranged for burning 'fuel so as to generate heated products of combustion, a heat exchanger device arranged to be heated by said fuel burning means during the operation thereof, a heat exchanger member extending longitudinally ofv and for a substantial portion of the length of said chimney, said heat exchanger member and chimney providing at least part of a path through -which the products of combustion flow 'to said atmospheric discharge and a separate path for flow of air in intimate countercurrent heat exchange relationship with the combustion' products path, means including an air blower operable to supply from said space to the upper portion of said air path, air to be heated and under a pressure greater than the pressure of the products of combustion, the lower end of said air path having an outlet for discharging heated air into-said space, an electric motor for operating said air blower, an electric circuit for said motor including a thermostatic switch'having a thermal element responsive to the temperature of the combustion products at the upper end of said heat exchanger member and means, including a manually operated switch insaid circuit,

. for preventing the operation of said air moving device as aforesaid without interfering with the generation of heated products of combustion when it is desired to operate said fuel burning means for the purpose of heating said heat exchange device without operating said air blowerr 22. A heating system for supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a chimney which forms part of the building and which extends upright to and above the roof of the building and has an atmospheric discharge external of the space, means associated with the lower portion of said chimney and constructed and arranged for burning fuel so as to generate heated products of combustion, a heat exchanger device arranged to be heated by said fuel burning means during the operation thereof, a heat exchanger member extending longitudinally of and for a substantial portion of the length of said chimney, said heat exchanger member and chimney providing at least part of a path through which the products .of combustion flow to said atmospheric discharge and a separate path for flow of air in intimate countercurrent heat exchange relationship with the combustion products path, means including an air blower operable to supply from said space to the upper portion or said air path, air to be heated and under a pressure greater than the pressure of the products of combustion, the lower end of said. air path having an outlet for discharging heated air into said space, an electric motor for operating said air blowe an electric circuit for said motor including a thermostatic switch-having a thermal element responsive to the temperature of the combustion products at the upper end of said heat exchanger switch in said circuit, for preventing the operation of said air moving device as aforesaid when without interfering with the generation of heated products of combustion it is desired to operate said iuel burning means for the purpose of heating said heat exchange device without operating said air blower, and means for dissipat-- 'ing heat from said heat exchanger member and externally of said'spaoe when said fuel burning means are operated for the purpose of heating 10 said heatexchan'ge devicewithout supplying member, means, including amanually operated heated air to said space.

. MORITZ L.

Patmt No. 2,313,855.

I CERTIFICATE oF comm'cncn.

May 16, 19%.

110mm. L.

it is hereby certifiegi that error appears in the printed specification of the above numbered patent requiring 'correction'as follows: Page 1, sec- 0nd co1umn,-line 7, for eimi alr' rend -simi1a.rline [1.5, after combustion chamber 38 insert a-commag-pege 5, first column, line 75, after house insert); comma} page 5, .first colmnnQline 56, claim 5, for path of read --pe.th to--; page 11, second colimn, line 1, claim 22, strike out when" and insert the sameafter "combustion", line-5, same claim; and

that the said Letters Patent should be read with this correction therein that the eerie may conform to the record of the case in the Patent Office.

Signed and sealed this 25th day of July, A. D. 19%.

4 Leslie Frazer (Seal) I Acting Commissioner of Patents. 

